Hydraulic control valve



Aug. 1938. Ai.; c. DUDLEY 2,127,679 l HYDRAULIC CONTROLl VALVE FiledApril 28, 1957 Jell/5f. 1 2

a 1 n my n 4 uw m 9 3 m A n Wl E D. m. f A l l n A N ff/ l. m.. H E WMWWW Q 7 m IIIIII f' Patented Aug. 23,1938

s-ra'rss einen HYDRAULIC coN'rRoL VALVE Edward Clifford Dudley, Fresno,Calif.

Application April 28, 1937, Serial No. 139,370

1 claim.4 (c1. 251-108) This invention relates generally to a hydrauliccontrol valve and in particular relates to an improved hydraulic controlvalve, o-f the four-Way type, for use in connection with double actinghydraulic control cylinders as noW commonly used in connection withtractor drawn learth working and moving implements'such as carrierScrapers, etc., the valve being interposed in the conduits between theconstant pressure pump on the tractor and the control cylinder on theimplements.

The principal object of the present invention is' to provide a novelporting arrangement in a four-Way control valve of the plug type. Theporting is so disposed that when the valve is in a central or neutralposition, the high pressure oil from the pump will by-pass backto theoil reservoir onl the tractor and when the valve is turned in onedirection or the other to feedv These objects I accomplish by means ofsuch structure and relative arrangement of parts as will fully appear bya perusal of the following specification and claim.

In the drawing similar characters of reference indicate correspondingparts in the several views:

Figure 1 is an elevation of my improved hydraulic control valve.

Figure 2 is a sectional elevation on line 2 2 Of Fig.` l.

Figure Seis a cross section takenv online 3 3 of Fig. 2, and illustratesthe valve in a neutral or by-passing position.

Figure 4 is a similar Viewl but illustrating the valve in an operativeposition.

Referring now more particularly to the characters of reference on thedrawing, the device comprises a valve shell I bored from one end toreceive a tapered plug 2; the plug when disposed in the bore terminatingshort of the bottom thereof to form a pocket as shown at' 3.- An axialstern I projects from the enlarged end of the plug 2 some distancebeyond the adjacent end of the valve shell; a control handle Hprojecting radially from the outer end of the stem. A head 5 is threadedinto the initially open end of the shell and forms a journal for stem t.

The head 5 is provided with an enlarged bore 6 below its stem journalingportion and openV at its inner end and thus in communication with achamber I formed between the'inner face of the head and adjacentend ofplug 2. An oil seal 8, of suitable type, is disposed about the stem andin the bottom of bore 6. A compression spring 9 is disposed about thestem between the oil seal 8 and the adjacent end of plug 2; said springnormally being under compression and urging the plug into the taperedbore. If desired, a washer I0 may be disposed between the oil seal andspring 'whereby to increase the compression of spring 9 for the purposehereinafter described.

The shell I is provided with two oppositely disposed, radial portsindicated ,at I I and I2 respectively. Another radial port I3 isdisposed centrally between the ports II and I2 while a fourth port I@ isformed in the shell axially relative to the plug and communicates withthe bottom of the tapered bore which forms pocket 3. The tapped radialports II and l2 are the supply ports from which the conduits (not shown)lead to the double acting hydraulic control cylinder; the radial port I3is the by-pass port which is connected to the oil supply reservoir; andthe axial port I@ is the high pressure feed port adapted to be connectedto the pump.

The plug 2 is formed with an L-shaped passage I5 Which is open at oneend to the small end of the plug and open at the other end through theside wall of the plug in the plane of the radial ports. The plug is alsoformed with a pair of outwardly facing, opposed parallel grooves I6 andIl respectively cutA transversely therein; said grooves also beingdisposed in the plane of the radial ports and at right angles to theaxis of ports I I and I2 when passage I5 and port I3 are in fullregister as shown inFig. 3. A bleed opening I8 extends longitudinallythrough the plug to one side of passage l5; said bleed opening aiordingcommunication between pocket 3. and chamber 1.

In use my improved hydraulic control valve is mounted in any. suitablemanner on the tractor, and connected between the pump and double actinghydraulic control cylinder in the manner heretofore described.

When the valve is in a-neutral or central position as l.shown in Fig. 3,the L-shaped passage l5 in the plug is in register withradial port I3and axial port Id thus allowing of unrestricted bypassing of oil fromthe constant pressure pump back to the reservoir. However when the plugis turned in one direction or the other a predetermined distance eitherradial port I I or I2 is placed in communication with the passage I5thus feeding oil under pressure to one side of the double actinghydraulic control cylinder on the drawn implement. At the same time oneof the grooves I6 or I'I will be brought into register between radialby-pass port I3 and the other radial supply port relieving the pressureon the other. side of the control cylinder. Figure 4 of the drawingillustrates the position of the plug when oil is being supplied toportII and lay-passed from port I2. To control the operation of thedouble acting control cylinder, it is therefore only necessary to swingthe handle H of the valve to one side or the other of its neutral orcentral position.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fullls the objects of theinvention as set forth herein. L

While this specification sets forth in detail the present and preferredconstruction o! the device, still in practice such deviations from suchdetail may be resorted to as do not yform a departure from the spirit ofthe invention, as dened by the appended claim.

Having thus described my invention, what I claim as new and useful anddesire to secure by Letters Patent is:

In a hydraulic control valve including a shellP and a rotatable plugdisposed therein, a radial by-pass port in the shell, a. pair of feedports in the shell, the radial by-pass port being disposed centrallybetween said feed ports and in the same plane transversely of the valve,and an axial supply port in the shell, theplug having a passage thereinextending from the end adjacent the axial supply port to an opening inthe side of the plug in the same plane as said'by-pass port and feedports, the plug also having a pair of transverse grooves cut in the facethereof in the plane of said opening and between which the opening isdisposed; the portsin the shell and the opening and grooves in the plugbeing arranged so that when the plug opening is in register with theradial by-pass port, the feed ports will be closed, and when the plug isrotated a predetermined distance in one direction the plug opening willregister with one feed port and one groove will establish communicationbetween the other feed port and by-pass port. l

l 4 EDWARD CLIFFORD DUDLEY

